100 lines
3.4 KiB
JavaScript
100 lines
3.4 KiB
JavaScript
(function() {
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var _ = typeof require == 'function' ? require('..') : window._;
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QUnit.module('Chaining');
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QUnit.test('map/flatten/reduce', function(assert) {
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var lyrics = [
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'I\'m a lumberjack and I\'m okay',
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'I sleep all night and I work all day',
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'He\'s a lumberjack and he\'s okay',
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'He sleeps all night and he works all day'
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];
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var counts = _(lyrics).chain()
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.map(function(line) { return line.split(''); })
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.flatten()
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.reduce(function(hash, l) {
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hash[l] = hash[l] || 0;
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hash[l]++;
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return hash;
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}, {})
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.value();
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assert.strictEqual(counts.a, 16, 'counted all the letters in the song');
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assert.strictEqual(counts.e, 10, 'counted all the letters in the song');
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});
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QUnit.test('select/reject/sortBy', function(assert) {
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var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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numbers = _(numbers).chain().select(function(n) {
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return n % 2 === 0;
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}).reject(function(n) {
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return n % 4 === 0;
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}).sortBy(function(n) {
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return -n;
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}).value();
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assert.deepEqual(numbers, [10, 6, 2], 'filtered and reversed the numbers');
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});
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QUnit.test('select/reject/sortBy in functional style', function(assert) {
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var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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numbers = _.chain(numbers).select(function(n) {
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return n % 2 === 0;
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}).reject(function(n) {
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return n % 4 === 0;
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}).sortBy(function(n) {
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return -n;
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}).value();
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assert.deepEqual(numbers, [10, 6, 2], 'filtered and reversed the numbers');
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});
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QUnit.test('reverse/concat/unshift/pop/map', function(assert) {
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var numbers = [1, 2, 3, 4, 5];
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numbers = _(numbers).chain()
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.reverse()
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.concat([5, 5, 5])
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.unshift(17)
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.pop()
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.map(function(n){ return n * 2; })
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.value();
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assert.deepEqual(numbers, [34, 10, 8, 6, 4, 2, 10, 10], 'can chain together array functions.');
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});
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QUnit.test('splice', function(assert) {
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var instance = _([1, 2, 3, 4, 5]).chain();
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assert.deepEqual(instance.splice(1, 3).value(), [1, 5]);
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assert.deepEqual(instance.splice(1, 0).value(), [1, 5]);
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assert.deepEqual(instance.splice(1, 1).value(), [1]);
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assert.deepEqual(instance.splice(0, 1).value(), [], '#397 Can create empty array');
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});
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QUnit.test('shift', function(assert) {
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var instance = _([1, 2, 3]).chain();
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assert.deepEqual(instance.shift().value(), [2, 3]);
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assert.deepEqual(instance.shift().value(), [3]);
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assert.deepEqual(instance.shift().value(), [], '#397 Can create empty array');
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});
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QUnit.test('pop', function(assert) {
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var instance = _([1, 2, 3]).chain();
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assert.deepEqual(instance.pop().value(), [1, 2]);
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assert.deepEqual(instance.pop().value(), [1]);
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assert.deepEqual(instance.pop().value(), [], '#397 Can create empty array');
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});
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QUnit.test('chaining works in small stages', function(assert) {
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var o = _([1, 2, 3, 4]).chain();
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assert.deepEqual(o.filter(function(i) { return i < 3; }).value(), [1, 2]);
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assert.deepEqual(o.filter(function(i) { return i > 2; }).value(), [3, 4]);
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});
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QUnit.test('#1562: Engine proxies for chained functions', function(assert) {
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var wrapped = _(512);
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assert.strictEqual(wrapped.toJSON(), 512);
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assert.strictEqual(wrapped.valueOf(), 512);
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assert.strictEqual(+wrapped, 512);
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assert.strictEqual(wrapped.toString(), '512');
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assert.strictEqual('' + wrapped, '512');
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});
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}());
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